FloodsFloodsChapter 17

Sections 2 & 3Pages 567-582

Chapter 17 Sections 2 & 3Pages 567-582

Floods

• Are the most dangerous weather-related events in the US.

• Floods occur when water pours into a stream or river that it overflows its banks and covers the land on either side.

Flash Floods

• A sudden, violent flood when water rises very rapidly.

• Unexpected floods are the most dangerous.

• It occurs within a few hours or even a few minutes of a storm.

Predicting Floods

• Advanced warnings can help reduce flood damage and loss of life.

• Weather satellites can supply information about snow cover, so scientists can estimate how much water will rush into the river when it melts.

• Scientists check river gauges that measure water levels.

Predicting Floods

• Forecasters can predict flood heights at different points on the river with the goal to help prepare people and evacuate.

• A flood watch- means that flooding is possible.

• A flood warning- means that flooding has been reported or is about to occur. Take action!

Flood Emergency Safety

• First rule of flood safety- move to higher ground and stay away from flood waters.– Do not try to cross streams and rivers that

look flooded.– Do not play in water.

• A few centimeters of water can sweep you off your feet.

– Do not try to drive on a flooded road.• Moving water can sweep a car away.• Leave the car and move to higher ground.

Other Flood Hazards

• Floods can knock down electrical poles, wires- cutting off power supplies.

• Can saturate soil, causing landslides or mudslides.

• Emergency vehicles cannot get through flooded roads.

• Flood waters can pollute water in wells and water treatment plants.– Be careful with anything that flood waters have

touched.– Boil water before drinking it.

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